Methods to Plant, Develop, and Look after ‘San Marzano’ Tomatoes

‘San Marzano’ tomatoes are a culinary delight. Thought of to be a high – even one of the best – paste tomato, this tomato carries a strong, advanced taste in a plum tomato kind.

Initially from southern Italy and prized to be used in sauces, This selection brings heirloom traits of vigorous progress and distinctive taste to the backyard. Even when we don’t reside within the shadow of Mount Vesuvius, with fertile soils and boundless sunshine, we are able to imbue a little bit of the Italian countryside in our personal gardens and kitchens by rising ‘San Marzano’ heirloom tomatoes.

San Marzano Roma Pole Tomato Seeds

San Marzano Roma Pole Tomato Seeds
  • Ancestor to many U.S. paste tomatoes.
  • Cherished by Italians for superior sauces.
  • Vigorous vines yield plentiful harvests.
  • Perfect for sauces, canning, and contemporary dishes.
  • Dependable efficiency for all gardeners.

View at


The 'San Marzano' tomatoes are elongated, deep red fruits with a firm texture, smooth skin, and a distinctive plum-like shape.

Plant Kind

Annual vegetable

Native Space

Central America, South America, Europe

Watering Necessities


Pests & Illnesses

Aphids, flea beetles, hornworms, leaf spot

What are ‘San Marzano’ Tomatoes?

With its robust, sprawling vines and broad, deep green leaves, the tomato plant produces clusters of elongated, bright red and green fruits.
Indulge within the essence of Italy with ‘San Marzano’.

These Italian heirlooms are well-known for his or her distinctive taste in pastes and sauces. These plum, or paste, tomatoes characteristic a fancy, wealthy taste excellent for preserving, canning, and contemporary consuming. 

True ‘San Marzano’ tomatoes originate within the Campania area of southern Italy, within the volcanically wealthy soils of Mount Vesuvius. Italian-grown ‘San Marzano’ tomatoes are stated to be sweeter and fewer acidic than these grown in different areas. 

These superior paste tomatoes are a prized export protected beneath an official governmental conference, the Denominazione d’Origine Protetta, or Protected Designation of Origin. This designation protects important meals and foodways of Italian origin. 

The designation means certifying jarred and canned tomatoes with an official seal. The tomatoes should be strains of the unique heirlooms, grown open air, harvested by hand in the summertime, and jarred halved or entire (you received’t discover true San Marzanos as contemporary produce, chopped, or diced in cans). The cans are recognizable in grocery shops and markets and are pricy due to their specialty.

Tomatoes grown outdoors the area are generally known as “San Marzano-style” tomatoes. For our personal style of the Italian countryside, we are able to develop this specialty heirloom in our gardens. 


The plant displays vigorous, indeterminate growth with lush, deep green foliage and bountiful clusters of elongated, rich red and green unripe fruits.
Savor the bountiful, strong harvest of elongated, candy plum tomatoes.

This selection yields a great deal of lengthy, slender, pointed plum tomatoes, rising in clusters of six to eight tomatoes every. Fruits mature 70-90 days after transplanting. These are massive for paste tomatoes, with every rectangular fruit weighing about 5 to 6 ounces and rising three to 4 inches lengthy. ‘San Marzanos’ are candy in taste and have low acidity. The brilliant purple tomatoes have much less water and seed content material than different plums, making them meaty and thick – preferrred for pasting.

Along with their scrumptious taste, these vegetation are vigorous indeterminate growers with good illness resistance. Crops resist fusarium and verticillium wilts, that are frequent (and sometimes deadly) fungal points for tomatoes.

‘San Marzano’ is an indeterminate tomato with lengthy vines that attain six toes or longer. Crops develop all season and produce fruit from late summer time by way of frost. As productive fruiters, they want a big tomato cage or staking/trellising for finest progress and help.

Native Space

Close-up of ripe tomatoes in a plate showing elongated fruit with a slender, cylindrical shape, boasting a vibrant red hue and smooth, thick skin.
Named after its sun-kissed birthplace, this cherished tomato thrives.

‘San Marzano’ is known as for its city of cultivation, San Marzano sul Sarno, within the Salerno province of Campania south of Naples. This area of southern Italy options plentiful sunshine, delicate temperatures, and fertile soils.

Its ancestors are small tomatoes originating in coastal South America, with a slender rising vary bordered by the Andes Mountains from Ecuador to Chile. People cultivated this small-fruited plant, spreading its vary all through Central and South America. The fruits that turned the trendy tomato started in cultivation some 7,000 years in the past.

Explorers and colonists from Spain introduced domesticated tomatoes to Europe within the fifteenth and sixteenth centuries. They rose in reputation in delicacies within the seventeenth and 18th centuries.


Close-up of a gardener's hand planting tiny tomato seeds in a seed starter tray filled with soil.
Sow seeds early, rotate crops for strong homegrown tomatoes.

Tomatoes require heat air and soil temperatures for finest progress. These heirlooms are open-pollinated and develop simply from seed. Begin seeds indoors 4 to 6 weeks earlier than your ultimate frost date for finest outcomes. Transplant seedlings open air one to 2 weeks after the final frost or as nighttime temperatures exceed 55°F (13°C).

When selecting a backyard location for tomatoes, choose a spot the place you haven’t grown different nightshades prior to now 12 months. Tomatoes profit from an annual crop rotation. As a nightshade, they’re vulnerable to illnesses from different nightshades like eggplants, peppers, potatoes, and tomatillos. Rotating crops helps keep away from lingering soil-borne illnesses.

Within the floor, area vegetation two- to 3 toes aside to permit for lengthy vines and good air circulation. For row plantings, area rows three to 4 toes aside. 

Plant tomato seedlings deeply to advertise a strong root system, with two-thirds of the stem within the floor and one-third uncovered. The stem has a particular plant adaptation  – its hairs and nodes set roots for extra vigorous vegetation and better water and nutrient absorption.

The sprawling vines want sturdy help to maintain fruits and stems upright. A five-foot-tall by two-and-a-half-feet-wide tomato cage put in place at planting suffices. Or, go for trellising or staking to help the fruiting vines.

To develop in containers, go for a 10-gallon or bigger pot with good drainage. Set up the vine help construction on the time of planting.

YouTube video


Close-up of a gardener's hands delicately transplanting a tomato seedling into the rich soil of the garden bed.
Put together seedlings for backyard life with gradual out of doors acclimation.

Seedlings rising indoors profit from a hardening-off interval earlier than being transplanted into the backyard. As frost passes and temperatures heat, progressively expose seedlings to out of doors backyard situations. 

Transfer vegetation outdoors to expertise just a few hours of daylight and pure breezes (however not winds). Step by step transfer the vegetation to situations mirroring their new backyard location. Do that over per week to 10 days to permit seedlings to acclimate to outdoors rising situations.

Methods to Develop

‘San Marzano’ tomatoes are prolific growers and easy-care tomato vegetation. Give them loads of daylight, constant water, and good air circulation for one of the best well being and vigor.


Close-up of ripe, elongated, deep red tomatoes nestled among glossy, serrated, green leaves basking under the full sun.
Solar-kissed tomatoes thrive with ample morning mild and shade.

Development is finest in full solar. The optimum quantity of daylight is six to eight hours each day.

In sizzling rising areas, present afternoon safety from intense, direct daylight. Morning solar and dappled afternoon mild are preferrred to stop fruit and leaf burn.


Close-up of a male gardener in blue jeans watering tomato plants from a watering can in a sunny garden.
Constant watering fosters wholesome progress and plentiful fruiting.

Present one to 2 inches of water per week for constant moisture. Two deep soakings per week are typically sufficient when situations are delicate. As summer time temperatures rise, improve watering classes as wanted to keep up even soil moisture.  

Fluctuations in watering stress tomato vegetation and result in pest and illness points. Common water is finest, and a soil contact take a look at to really feel for dryness helps keep away from overly dry or moist soils.

One other measure to stop illness in the case of tomato watering is to keep away from splashing the leaves when possible. Watering on the soil stage and base of the plant permits water to penetrate the roots with out spreading fungus or micro organism among the many foliage. In case your backyard depends on sprinklers or overhead sprays, water within the early morning so leaves dry within the solar.

Repeatedly test the moisture stage of vegetation rising in containers. Pots dry out rapidly in the summertime warmth and heat, drying winds. Use a well-draining potting combine suited to greens and mix with compost to retain moisture.


Tomato bush seedlings feature slender stems with delicate, pale green leaves emerging from a central stem, growing in rows in a garden bed.
Thriving in fertile, well-draining soils, they yield bountiful harvests.

‘San Marzano’ tomatoes choose organically wealthy soils. Barely acidic soils with a pH between 6.0 and 6.8 are finest. Above all, well-draining soils are essential to tomato well being. 

At planting, add one-third compost to two-thirds high-quality natural soil combine. For native soils, add a extra beneficiant heap of compost, as much as one-half of the composition.

Temperature and Humidity

Close-up of unripe, green, elongated  tomato fruit growing on a bush under the dappled sun in the garden.
Summer season heat fosters strong progress with ample air circulation.

‘San Marzano’ are frost-sensitive vegetation that thrive and produce finest within the warmth of summer time. Seeds germinate with temperatures between 70-90°F (21-32°C). Seedlings develop outdoors with air temperatures above 55°F (13°C) and soil temperatures above 60°F (16°C). Heat temperatures between 70-80°F (21-27°C) are prime for progress.

Tomatoes thrive in sizzling, humid summers, however loads of air circulation round vegetation is critical to counteract humid situations and forestall pests and illnesses. 


Close-up of a gardener's hand in a green glove spreading chemical fertilizer to young tomato plants.
Nutrient-rich fertilization promotes plentiful flowering and fruitful harvests.

This productive fruiting annual advantages from vitamins to flower and fruit vigorously. Compost and fertile soils set tomatoes up for fulfillment, and fertilizer functions hold them thriving.

Apply a low-grade fertilizer like 5-5-5 or 5-10-10 at planting. Natural choices of fish emulsion, kelp, and seaweed at planting and through progress add the required enrichment for rising, flowering, and fruiting.

For flowering and fruiting, go for a fertilizer larger in phosphorous (the “P” within the N-P-Okay fertilizer fee) and decrease in nitrogen (N).  A 6-8-12, 8-32-16, or 6-24-24 ratio is common for tomatoes within the flowering section. Natural tomato-specific fertilizers could have these formulations.

Overfertilizing and an excessive amount of nitrogen result in stress and illness points. Additionally they create leafy vegetation with few blooms or fruits. 

Tomatoes generally want calcium enrichment, indicated by yellowing leaves and blossom finish rot. In lots of of those circumstances there may be sufficient calcium within the soil, however not sufficient water for the nutrient alternate that funnels calcium to your vegetation. Take a look at your soil earlier than planting, and amend as wanted. Then water frequently after planting to offer correct nutrient content material for luscious tomatoes.


Close-up of a gardener's hand pinching off tomato suckers in a greenhouse.
Pinch off low offshoots for optimum nutrient distribution and airflow.

Pruning isn’t mandatory with caged tomatoes, however pinching off low offshoots helps direct vitamins to the higher elements of the plant, particularly with staked or trellised vegetation. Pinch off suckers as they seem to inhibit detracting progress and improve airflow across the base of the plant.

Mulch after the solar has had time to heat plant roots for progress. Mulching too early and at planting can inhibit the solar’s heat from reaching the encircling soil. When stems attain 18-24 inches tall, layer two to 3 inches of weed-free straw round vegetation to assist with moisture retention, weed suppression, and soil temperature regulation.


These are open-pollinated heirlooms, which means they’ll come true to sort from seed until they’ve cross-pollinated with one other close by tomato selection. If you happen to hope to protect the true heirloom for seed assortment within the dwelling backyard, present 35 toes between homegrown tomato varieties or get pleasure from your personal hybrid the next season from cross-pollinated picks.

Rising From Seed

Close-up of young tomato seedlings in a seed starter tray, producing short, upright, hairy stems with complex foliage consisting of oval, serrated green leaflets.
Start seeds indoors for a thriving summer time backyard.

Sow seeds in early spring after the final frost in delicate climates or indoors 4 to 6 weeks earlier than the anticipated ultimate frost date in chilly climates. Tomato seeds germinate rapidly, often in 5 to 10 days.

To sow seeds indoors, plant them ¼ inch deep in a light-weight potting medium in a tray, cell, or small pot with drainage. Place the seeds in a heat spot with temperatures between 70-90°F (21-32°C) for germination. Preserve the potting media evenly moist with common misting.

When sprouts emerge, place the seedlings in a sunny location like a windowsill. When two to 3 units of true leaves seem, step seedlings up from trays and cell packs to a small pot. Seedlings are able to harden off open air after they attain six inches tall and vast.

Frequent Issues

Fortuitously, ‘San Marzano’ tomatoes aren’t overly bothered by pests. They’re additionally disease-resistant to the standard tomato fungal issues of fusarium and verticillium wilts. 

This cultivar continues to be vulnerable to frequent tomato issues. One of the simplest ways to stop tomato pests and illnesses is to keep up optimum cultural necessities, particularly constant watering, air circulation, soil well being, and crop rotation. Companion vegetation for tomatoes, like basil, marigolds, and dill, entice helpful bugs and promote plant well being.


Close-up of tiny green aphids on a serrated tomato leaf in the garden.
Early pest detection and natural options safeguard tomatoes naturally.

Common scouting to identify pests early is one of the best management towards fast injury to ‘Sungold’ tomatoes. Use natural and food-safe pest controls concerning meals crops, and comply with label directions to keep away from impacting wholesome vegetation, flowers, and pollinators.

Aphids generally go to ‘San Marzano’ tomatoes. These are frequent sap-sucking backyard bugs that don’t typically trigger a extreme menace however can weaken and unfold illnesses amongst vegetation. Additionally they depart behind a sticky honeydew that may result in black, sooty mould. 

If you happen to discover the insect or see indicators of curled leaves or stunted progress, spray vegetation with a stream of water early within the day to knock them off stems. A easy horticultural cleaning soap or Neem oil treats infestations. Nonetheless, these have an effect on pollinators and helpful bugs. Use them with warning.

Predatory bugs feed on aphids, so planting pollen and nectar-rich vegetation close by advantages vegetable crops, growing biodiversity and pure pest management.


Paste tomatoes are vulnerable to blossom finish rot, which is extra of a physiological dysfunction than a illness. As with pests, one of the best illness management is prevention by way of cultural situations.

Blossom Finish Rot

Close-up of a woman's hand holding a tomato affected by blossom end rot, displaying dark, sunken lesions at the blossom end.
Keep constant moisture and enrich soil to stop blossom finish rot.

Blossom finish rot seemingly outcomes from fluctuations in watering and the plant’s lack of ability to soak up vitamins, together with calcium. It’s evident when a growing tomato instantly turns into brown and rotted on the base—what a tragic sight.

Paste tomatoes like ‘San Marzano’ could expertise blossom finish rot on account of their decrease moisture content material. Present common irrigation, particularly throughout dry spells, for constant moisture. Add calcium to the encircling soil by way of kelp, seaweed, and calcium components.

The precise fruits experiencing blossom finish rot received’t reverse, so reducing off the broken tomato is finest. Nonetheless, future tomatoes received’t essentially be affected should you present even moisture, compost-rich soils, low-nitrogen fertilizer, and calcium.

Leaf spots, Anthracnose, and blights are additionally frequent tomato illnesses. These are finest managed by way of pruning away diseased plant elements, and tossing closely affected vegetation. Once more, crop rotation and pest management by way of planting a biodiverse backyard that pulls beneficials can even forestall many illnesses.

Ceaselessly Requested Questions

These heirloom plum tomatoes originate in southern Italy. They’re among the many finest for taste and richness in paste tomatoes. True ‘San Marzano’ tomatoes are a protected Italian export protect. They develop simply from seed anyplace tomatoes sometimes develop.

They’re prolific fruiters with heavy yields of plum tomatoes, every reaching three to 4 inches lengthy and one and a half inches vast. A person plant produces 10 to twenty kilos (or 30 to 60 fruits) of Roma-sized tomatoes.

They ripen between 70-90 days after transplanting. When totally ripe, the plum tomatoes are brilliant purple and tender beneath a light-weight squeeze. Decide the fruits when totally ripe or earlier, as they start to indicate colour. They’ll totally ripen indoors, however hold them unrefrigerated for one of the best taste.

Last Ideas

Rising ‘San Marzano’ tomatoes conjures up easy pleasures from the backyard to the kitchen, like candy summer time pasta and Neapolitan-inspired pizza loved al fresco. As an easy-care tomato plant with productive fruits, this Italian heirloom plum may simply be a must-have within the tomato assortment.

Related Articles


Please enter your comment!
Please enter your name here

Latest Articles